The Exynos 4210, 4212 and 4412 are relatively well supported in mainline, and share a fair bit of code. Support for the Exynos 4415, however, was dropped as there were no devices in mainline that used it. In postmarketOS, the mainline kernel is packaged as linux-postmarketos-exynos4PMOS.
The Exynos 4 has a built-in hardware video decoding/encoding block called MFC v5. It has a mainline driver, which uses the v4l2m2m API (see Hardware video acceleration for more information). The firmware is packaged as linux-firmware-s5p-mfc.
The mainline kernel has some support for cameras (FIMC); fourkbomb who worked on the original Midas mainline port has made some progress in getting it to work, but this has not been set up in postmarketOS yet, nor is it supported by any apps.
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